目视飞行规则 contact flight rules; vfr visual flight rules; vfr = visual flight rule; visual-flight rules 目视飞行规则飞行 ver flight .
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contact flight rules
联络飞行规则
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Planes operated under visual flight rules -- rules that require only limited contact with air traffic controllers -- were grounded along with commercial aircraft in the hours immediately following the hijackings.
CNN: FAA lifts some restrictions on small aircraft
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